AQA Jun 2013 Paper 5 Q7 (with explained solutions) |

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AQA Jun 2013 Paper 5 Q7

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section b answer all questions in the spaces provided do not write outside the box an excess of a given reagent is added to each of the following pairs of aqueous metal ions for each metal ion state the initial colour of the solution and the final observation that you would make in each case write an overall equation for the formation of the final product from the initial aqueous metal ion a an excess of aqueous sodium carbonate is added to separate aqueous solutions containing fe h o and fe h o marks b an excess of concentrated hydrochloric acid is added to separate aqueous solutions containing cu h o and co h o marks wmp jun chem do not write outside the box c an excess of dilute aqueous sodium hydroxide is added to separate aqueous solutions containing fe h o and cr h o marks d an excess of dilute aqueous ammonia is added to separate aqueous solutions containing al h o and ag h o marks turn over for the next question turn over wmp jun chem

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mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june marking guidance mark comments question a apply list principle throughout if extra colours and or extra observations given ignore state symbols in equations not blue green ppt must start from fe h o allow equations with na co allow co evolved but not just co apply list principle throughout if extra colours and or extra observations given ignore state symbols in equations allow equations with hcl iron ii green solution gives a green precipitate feco h o fe h o co iron iii yellow purple brown lilac violet solution gives a brown rusty precipitate effervescence gas bubbles fe h o co fe h o oh co h o b copper ii blue solution gives a green yellow solution or blue solution turns to green yellow olive green cu h o cl cucl h o cobalt ii pink solution gives a blue solution or pink solution turns blue co h o cl cocl h o mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june c iron ii green solution gives a green precipitate fe h o oh fe h o oh h o chromium iii green ruby purple violet red violet solution gives a green solution or green ruby purple violet red violet solution turns green cr h o oh cr oh h o d al colourless solution gives a white ppt al h o nh al h o oh nh ag colourless solution remains a colourless solution no visible change ag h o nh ag nh h o apply list principle throughout if extra colours and or extra observations given ignore state symbols in equations allow equations with naoh ignore green ppt allow also with or oh balanced with or waters also allow two correct equations showing cr h o oh as intermediate apply list principle throughout if extra colours and or extra observations given ignore state symbols in equations oh also allow oh h o if nh h o nh ignore brown ppt allow equations involving ag o or ag oh

Question 1 2 3 4 5 6 7 8

Topics to revise

AQA > Inorganic chemistry > Transition metals >

7 Formation of coloured ions

AQA > Inorganic chemistry > Metal Ions in aqueous solutions >

3 Required practical 11: Identify transition metal ions

AQA > Inorganic chemistry > Transition metals >

9 Manganate titration

AQA > Inorganic chemistry > Transition metals >

1 General properties

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

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